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UWE-3.3-15-Q48PB-C Datasheet(PDF) 11 Page - Murata Manufacturing Co., Ltd. |
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UWE-3.3-15-Q48PB-C Datasheet(HTML) 11 Page - Murata Manufacturing Co., Ltd. |
11 / 13 page UWE Series Wide Input, Isolated Eighth-Brick DC/DC Converters Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com Positive-polarity models (“P" part-number suffix) are enabled when the On/Off Control is left open or is pulled high, as per Figure 4. Positive-polarity devices are disabled when the On/Off Control is pulled low. Negative-polarity devices (“N” suffix) are off when the On/Off Control is open (or pulled high), and on when the On/Off Control is pulled low with respect to –VIN as shown in Figure 5. Dynamic control of the remote on/off function is facilitated with a mechanical relay or an open-collector/open-drain drive circuit (optically isolated if appropri- ate). The drive circuit should be able to sink appropriate current (see Performance Specs) when activated and withstand appropriate voltage when deactivated. Applying an external voltage to the On/Off Control when no input power is applied to the converter can cause permanent damage to the converter. Trimming Output Voltage UWE converters have a trim capability that allows users to adjust the output voltages. Adjustments to the output voltages can be accomplished via a trim pot (Figure 6) or a single fixed resistor as shown in Figures 7 and 8. A single fixed resistor can increase or decrease the output voltage depending on its connec- tion. The resistor should be located close to the converter and have a TCR less than 100ppm/°C to minimize sensitivity to changes in temperature. If the trim function is not used, leave the trim pin floating. A single resistor connected from the Trim to the +Output, or +Sense where applicable, will increase the output voltage in this configuration. A resistor con- nected from the Trim to the –Output, or –Sense where applicable, will decrease the output voltage in this configuration. Trim adjustments greater than the specified range can have an adverse affect on the converter's performance and are not recommended. Excessive voltage differences between VOUT and Sense, in conjunction with trim adjust- ment of the output voltage, can cause the overvoltage protection circuitry to activate (see Performance Specifications for overvoltage limits). Power derating is based on maximum output current and voltage at the converter’s output pins. Use of trim and sense functions can cause output voltages to increase, thereby increasing output power beyond the converter's specified rating or cause output voltages to climb into the output overvoltage region. Therefore: (VOUT at pins) x (IOUT) <= rated output power ON/OFF CONTROL CONTROL + Vcc -INPUT Figure 4. Driving the Positive Polarity On/Off Control Pin –INPUT ON/OFF CONTROL + Vcc Figure 5. Driving the Negative Polarity On/Off Control Pin LOAD R2 +OUTPUT –INPUT +INPUT ON/OFF CONTROL TRIM +SENSE –OUTPUT –SENSE Figure 8. Trim Connections To Decrease Output Voltages 20k : 5-20 TURNS LOAD +OUTPUT –INPUT +INPUT ON/OFF CONTROL TRIM +SENSE –OUTPUT –SENSE Figure 6. Trim Connections Using A Trimpot LOAD R1 +OUTPUT –INPUT +INPUT ON/OFF CONTROL TRIM +SENSE –OUTPUT –SENSE Figure 7. Trim Connections To Increase Output Voltages Using a Fixed Resistor MDC_UWE Series.A17 Page 11 of 20 |
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